UI: Small Tweaks to Modifier Layouts for Consistency

These changes are smaller, made based on feedback and a pass on all
the layouts for clarity and consistency. The Multires modifier UI will
be addressed in a separate patch. Here is an overview of the changes:

Renaming Options:
  - Build: "Start" -> "Start Frame"
  - Curve: "From Radius" -> "Size from Radius"
  - Screw: "Calc Order" -> "Calculate Order"
  - Displace, Warp, Wave: "Texture Coordinates Object" -> "Object"

Move Mode Toggle to Top & Expand:
  - Bevel, Boolean, Normal Edit, Subdivision

Use Columns for Tighter Spacing:
  - Displace, Explode, Ocean, Particle Instance, Remesh, Shrinkwrap,
    Solidify, Warp, Weighted Normal, Wave

Misc:
  - Bevel: Set inactive properties for vertex bevel
  - Mesh Sequence Cache: Remove box for cache file
  - Skin: Don't align "Mark Loose" and "Clear Loose"
  - Array: Expand relative offset subpanel by default
  - Array: Move start cap, end cap to a new subpanel
  - Bevel: Move width type above width

Differential Revision: https://developer.blender.org/D8115

source/blender/modifiers/intern/MOD_normal_edit.c

@@ -709,11 +709,12 @@ static void panel_draw(const bContext *C, Panel *panel)
   PointerRNA ob_ptr;
   modifier_panel_get_property_pointers(C, panel, &ob_ptr, &ptr);
 
-  uiLayoutSetPropSep(layout, true);
-
   int mode = RNA_enum_get(&ptr, "mode");
 
   uiItemR(layout, &ptr, "mode", UI_ITEM_R_EXPAND, NULL, ICON_NONE);
+
+  uiLayoutSetPropSep(layout, true);
+
   uiItemR(layout, &ptr, "target", 0, NULL, ICON_NONE);
 
   col = uiLayoutColumn(layout, false);